English

Tailoring a pair of pants

Algebraic Geometry 2021-01-19 v2 Geometric Topology Symplectic Geometry

Abstract

We show how to deform the map Log ⁣:(C)nRn\operatorname{Log}\colon (\mathbb{C}^*)^n \to \mathbb{R}^n such that the image of the complex pair of pants P(C)nP^\circ \subset {(\mathbb{C}^*)^n} is the tropical hyperplane by showing an (ambient) isotopy between P(C)nP^\circ \subset {(\mathbb{C}^*)^n} and a natural polyhedral subcomplex of the product of the two skeleta S×ΣA×CS\times \Sigma \subset \mathcal{A} \times \mathcal{C} of the amoeba A\mathcal{A} and the coamoeba C\mathcal{C} of PP^\circ. This lays the groundwork for having the discriminant to be of codimension 2 in topological Strominger-Yau-Zaslow torus fibrations.

Cite

@article{arxiv.2001.08267,
  title  = {Tailoring a pair of pants},
  author = {Helge Ruddat and Ilia Zharkov},
  journal= {arXiv preprint arXiv:2001.08267},
  year   = {2021}
}

Comments

final version, to appear in Adv. Math

R2 v1 2026-06-23T13:18:12.130Z